Restructuring (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Restructuring Cost and Reserve [Line Items]
Restructuring	$ 7,986	$ 45,556
Operational Initiatives [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring	5,700
Total expected cost	16,000
Restructuring costs incurred since inception	5,700
November 2015 Restructuring Plan [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring	1,200	38,500
Restructuring costs incurred since inception	76,400
January 2015 Restructuring Plan [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring	800	$ 7,100
Restructuring costs incurred since inception	$ 93,700